Her ability forces all creatures your opponents control to attack each turn if able, creating huge problems for decks built around keeping specific utility creatures alive turn after turn
It triggers when you flicker an artifact or make an artifact token, and its pretty easy to do those things on opposing turns to draw more than one card a turn cycle
The other popular gameplay style is Commander, which comprises a 100-card Deck with no repeated cards, and very similar gameplay
They offer a fun and simple way to get better acquainted with the game using a deck thats well-balanced against other planeswalker decks from the same set
In formats with larger card pools, the graveyard zone often feels more like a second hand than a disposal area for used cards
Pawn of Ulamog works in the same strategies as Black Market, though a bit more slowly since it only triggers when your own creatures die